My wife's S3 had been burning through battery lately. I checked what was using the battery and Android OS was at the top. The stay awake time was over 6 hours. This is all while she was at work and the phone was in her purse. She also had the mobile data off because the building she's in had a lot of interference. I installed gsam and got some more details. The highest user was the kernel. Not sure what to do about this and didn't find another thread that covered this. Thanks for any input in advance.